Medium processing device and medium transaction device

A medium transaction device comprising:

• a take-in section that takes in a paper sheet shaped medium to be transacted from outside;
• a conveyance section that conveys the medium;
• a drum that is configured capable of rotating, and that wraps the medium conveyed in by the conveyance section onto a circumferential side face of the drum;
• a continuous main tape of which one end is fixed to the circumferential side face of the drum, and that wraps the medium onto the circumferential side face accompanying rotation of the drum such that the medium is interposed between the circumferential side face and the main tape;
• a main reel that takes up the main tape;
• a feed roller that is provided at a position separated from the circumferential side face of the drum and that feeds the main tape to convey the medium;
• a first tape roller that is provided at a position separated from the circumferential side face of the drum and around which the main tape pulled out from the main reel doubles back toward the circumferential side face of the drum;
• a second tape roller that is provided at a position separated from the circumferential side face of the drum, and that temporarily pulls the main tape away from the circumferential side face and doubles back the main tape so as to return toward the circumferential side face, after the main tape has been doubled back around the first tape roller and travelled along the circumferential side face of the drum, the second tape roller doubling back the main tape such that a first portion of the main tape doubled back around the first tape roller and a second portion of the main tape doubled back around the second tape roller come together to overlap each other at a location between the circumferential side face of the drum and the feed roller along the second portion of the main tape;
• a medium conveyance guide that is fixed at a position separated from the circumferential side face of the drum, that supports the second tape roller, and that guides conveyance of the medium;
• and
• a movable guide that is provided to the medium conveyance guide so as to be capable of moving to follow a drum diameter of the drum as the drum diameter changes according to a wrap-on amount of the medium, and that guides the medium being conveyed while being gripped between the first portion of the main tape doubled back around the first tape roller and the second portion of the main tape doubled back around the second tape roller such that the medium is guided between the circumferential side face of the drum and the medium conveyance guide.